68-0046—4
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2. If a gas leak is detected, tighten the pipe connection.
3. Stand clear while lighting main burner to prevent
injury caused from hidden gas leaks, which could cause
flashback in the appliance vestibule. Light the main burner.
4. With the main burner in operation, paint all pipe
joints (including adapters) and gas control inlet and
outlet with rich soap and water solution.
5. If another gas leak is detected, tighten adapter screws,
joints, and pipe connections.
6. Replace the part if gas leak cannot be stopped.
LIGHT THE PILOT BURNER FLAME
1. Turn the gas control knob clockwise
to OFF.
Wait five minutes to dissipate any unburned gas. Sniff
around the appliance near the floor. Do not relight the
pilot flame if you smell gas.
2. Turn the gas control knob counterclockwise to
PILOT. Push down and hold the gas control knob while
lighting the pilot flame.
3. Hold down the gas control knob about one minute,
then release.
• If the pilot flame goes out, turn the gas control
knob clockwise
to OFF and repeat steps 1
through 3.
• If pilot flame remains lit, turn the gas control
knob counterclockwise
to ON.
VR8200, VR4200
STARTUP AND CHECKOUT
ADJUST THE PILOT BURNER FLAME
The pilot flame should envelop 3/8 to 1/2 in. [10 to
13 mm] of the thermocouple tip. Refer to Fig. 13. To ad-
just the pilot flame:
1. Remove the pilot adjustment cover screw. Refer to
Fig. 2.
2. Turn the inner adjustment screw clockwise
to decrease or counterclockwise
to increase the pilot
flame.
3. Always replace the cover screw after adjustment and
tighten firmly to assure proper operation.
LIGHT MAIN BURNER
Follow the appliance manufacturer instructions or set the
thermostat setting above room temperature to call for heat.
Fig. 13—Proper flame adjustment.
3/8 TO 1/2 INCH
10 TO 13 mm
PROPER FLAME
ADJUSTMENT
THERMOCOUPLE
M3086
!
CHECK AND ADJUST GAS INPUT TO MAIN
BURNER
CAUTION
1. Do not exceed the input rating stamped on the
appliance nameplate, or manufacturer recom-
mended burner orifice pressure for the size
orifice(s) used. Assure the main burner primary
air supply is properly adjusted for complete
combustion (refer to the appliance manufacturer
instructions).
2. IF CHECKING GAS INPUT BY CLOCKING
THE GAS METER:
• Assure that the only gas flow through the
meter is that of the appliance being tested.
• Assure that other appliances are turned off
and their pilot burners are extinguished (or
deduct their gas consumptions from the
meter reading).
• Convert the flow rate to Btuh as described in
the Gas Controls Handbook (form 70-2602)
and compare to the Btuh input rating on the
appliance nameplate.
3. IF CHECKING GAS INPUT WITH A MA-
NOMETER (PRESSURE GAUGE):
• Assure the gas control knob is in the PILOT
position before removing the outlet pressure
tap plug to connect the manometer.
• Turn the gas control knob back to PILOT
when removing the manometer and replac-
ing outlet pressure tap plug.
• Shut off the gas supply at the appliance
service valve or, for LP gas, at the gas tank
before removing the outlet pressure tap plug
and before disconnecting the manometer and
replacing the outlet pressure tap plug.
• Perform the Gas Leak Test at the inlet pres-
sure tap plug.
Standard-Opening and Slow-Opening Pressure
Regulator
1. The gas control outlet pressure should match the
manifold pressure listed on the appliance nameplate.
2. With the main burner operating, check the gas control
flow rate using the meter clocking method or check the gas
pressure using a manometer connected to the gas control
outlet pressure tap. Refer to Figs. 2 and 3.
3. If necessary, adjust the pressure regulator to match the
appliance rating. Refer to Table 7 or 8 for the factory-set
nominal outlet pressures and adjustment ranges.
a. Remove the pressure regulator adjustment cap
and screw.
b. Using a screwdriver, turn the inner adjustment
screw clockwise
to increase or counter-
clockwise
to decrease the main burner gas
pressure.
c. Always replace the cap screw and tighten firmly
to assure proper operation.